d5607ad55c
The old NPM was using ScopInfo pass introduced in https://reviews.llvm.org/D20962, which in contrast to the LPM was using ScopInfoRegionPass. ScopInfo was instantiating all Scop objects immediately. After codegenning, all Scop objects need to be recomputed anyway, making this approach wastful. The PhaseManager inherited this behaviour from the NPM, leading to some concerns. Replace the instantiate-all behavior of ScopInfo with an on-demand instantiation. SCoPs now must be iterated using ScopDetection instead using ScopInfo, but only some unsed legacy NPM passes (now removed) were doing that anyway.
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